Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

C88 Soundness of FA

C88 Soundness of FA

C88 Soundness of FA

I am researching a non-conformity from a recent fine aggregate proficiency sample. My lab has been getting a consistently higher %loss for the past 4 years (multiple technicians, virtually the same equipment). We only do this test once a year when we participate in the proficiency testing program.

Using magnesium sulfate (from the grocery store) to make the solution
Checking the SpG of the solution using a 100ml beaker and weighing it
Temperature of solution is maintained within the prescribed range
Sample fractions are held in #80 sieves, nested during soaking
Dried completely before the next soak
Nested sieves are washed with warm water after final drying period
Sieved over the same sieves at the end to determine %loss

I don't think that any of the sample is physically being lost out of the containers, I did wonder about the amount of free crystals in the solution but can't get the SpG high enough without them. Does anyone have experience with this test? Is there a variable I'm not thinking of?

RE: C88 Soundness of FA

Instead of using generic Epsom Salt, do a comparison with reagent grade magnesium sulphate. The grocery store variety is likely more variable

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close